How do Less Wrong meetups differ from other similar gatherings you've been involved with? Are there any special needs idiosyncratic to this demographic?

To mention one minor thing. I've helped run many self-catered events for a medieval recreation society.. and one for the Less-Wrong crowd, and the biggest difference in terms of catering was the significantly-different ration of vegetarians.

While in the medieval society the proportion tends to be around 5-10% vegetarian (which you can generally help out by providing a few vegetable dishes alongside your main fare), the proportion at the LessWrong group was 30% all-vegan, and required basically making two main meals - one catered to vegans.

Note: this is one datapoint on the LessWrong side of things - it caught me off guard when planning.